in terms of harmonic oscillator eigenfunctions for scaled oscillator coordinates, and, for the coordinate \(Q\) , with a displaced oscillator coordinate; the scaling and displacement terms \(a, a_{IR}\)  and \(b\)  can be determined variationally or within a SCF approach for a given value of \(a_{1,2}\) . \(N\)  is a normalization constant.
When the \(Q\)  lattice coordinate is pushed to an off-equilibrium value by excitation of the infrared mode by a pump pulse, evidence that could indicate a transient state with a substantial increase of \(T_{c}\)  [1]}, [2]}, [3]} has been reported.
